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7,237
texts
209
images
52
audio
41
movies
1
data
Topics & Subjects
3,441
ERIC Archive
3,260
NASA Technical Reports Server (NTRS)
2,979
SATELLITE OBSERVATION
1,740
Observation
1,339
Classroom Observation Techniques
654
REMOTE SENSING
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Collection
3,441
Education Resources Information Center (ERIC) Archive
3,260
NASA Network Resource and Training Site
321
NASA Technical Documents
219
NASA Images
186
Ames Research Center Image Library
186
Images
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Creator
3,441
eric
3,260
nasa technical reports server (ntrs)
172
nasa/ames research center
74
defense technical information center
37
non
30
nasa
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Language
7,247
English
5
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1
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German
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